Bob Harper was at a loss for words when he reunited with the man who administered CPR on him when he was suffering a heart attack.

“There was a doctor in the gym,” the fitness guru, 52, recalled of the February 2017 incident on Wednesday’s “Dr. Oz” show. “My coach, my friends, they were all there but I did not know about this other person that was performing CPR on me.”

Oz went on to explain that they managed to track down the mystery man — whose name is Phillip — through the med students who work for his show, saying: “When they went back to medical school they were all talking about you. One of them is the classmate of that young man.”

Upon reuniting Harper with Phillip, the celebrity trainer was speechless.

“It’s really overwhelming … I don’t even know what to say,” a stunned Harper said. “I’ve never been at a loss for words and I’m a loss for words”

The trainer, who rose to fame on weight loss competition show “The Biggest Loser,” has spoken publicly about the experience that left him unconscious for two days. One year after his heart attack, he shared a photo of himself from the hospital. “To say I am grateful for my life is a MAJOR understatement,” he said.